#include <stdio.h>
#include <stdlib.h>

int main(int argc,const char *argv[],const char *envp[]){
    if (_putenv_s("MY_NEW_VAR","new_value") != 0){
        /* Handle error */
    }
    if (envp != NULL){
        for (size_t i = 0;envp[i] != NULL; ++i){
            puts(envp[i]);
        }
    }
    return 0;
}